Semihalf is maintaining the tree and patches, but I believe the original work done to support using a GPU on the platform was done by Linaro. I could be mis-remembering but I believe that is how things happened.

We are waiting for the final release of the EDK2 tree from NXP. I will refrain from promising anything until that is integrated.

The cores are not overclockable. 2.2Ghz will be the limit.